The Provinces of Prussia were the main administrative divisions of Prussia from 1815 to 1946. Prussia's province system was introduced in the Stein-Hardenberg Reforms in 1815, and were mostly organized from duchies and historical regions. Provinces were divided into several Regierungsbezirke, sub-divided into Kreise (districts), and then into Gemeinden (townships) at the lowest-level. Provinces constituted the highest level of administration in the Kingdom of Prussia and Free State of Prussia until 1933, when Nazi Germany established de facto direct rule over provincial politics, and were formally abolished in 1946 following World War II. The Prussian provinces became the basis for many federal states of Germany, and the states of Brandenburg, Lower Saxony, and Schleswig-Holstein are direct successors of provinces.